JP2009052190A - Apparatus for manufacturing braid like product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing a braid like product with suppressed flexibility (change of outer diameter), in a preferable productivity. <P>SOLUTION: The apparatus includes a circular knitting machine 2 carrying out circular knitting of yarns 11 to knit a braid 12, a through hole through which the braid 12 discharged from the circular knitting machine 2 passes, a heat treatment mold 4 for heat treating the braid 12 in the open hole, a take-up machine 5 taking up the braid 12 passed the through hole, detecting means (sensor 6a, 6b) detecting the difference between the knitting rate of the circular knitting machine 2 and the introducing rate of the braid 12 introduced into the open hole, and feed back controlling means controlling the braid knitting rate of the circular knitting machine 2 based on the result of the detection of the detecting means. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a string manufacturing apparatus suitable for manufacturing a string such as a support of a hollow porous membrane.

  In recent years, interest in environmental pollution has increased and regulations on water quality have been strengthened, and water treatment using a filtration membrane having excellent separation completeness and compactness has attracted attention. As the water treatment filtration membrane, for example, a hollow porous membrane is used. The hollow porous membrane requires not only excellent separation characteristics and permeation performance, but also high mechanical properties. As a hollow porous membrane excellent in mechanical properties, for example, as shown in FIG. 2, a hollow porous membrane having a porous membrane layer provided on the outer peripheral surface of a support made of a cylindrical braid obtained by rounding yarn is used. Are known. When the support is continuously passed through the annular nozzle, the hollow porous membrane is discharged from the annular nozzle, and after the coating solution is applied to the outer peripheral surface of the support, the coating solution is applied. The prepared support is passed through a coagulation bath, and the film-forming stock solution is coagulated with the coagulation liquid in the coagulation bath layer.

  The cylindrical braid as a support is usually manufactured by a string making machine. In a stringing machine, each thread is pulled out from a large number of bobbins erected on a flat plate, each thread is crossed and assembled, and each bobbin is moved along a predetermined path to thereby determine the positional relationship of the threads. A braid is manufactured by changing the pattern in a predetermined pattern.

However, the stringing machine has a problem in that it is difficult to increase the stringing speed and the productivity is low because a large number of divided bobbins move in a complicated manner. Usually, the stringing speed of the cylindrical braid by the stringing machine is about 10 to 20 m / hr. If the productivity is low, the cost of the support (cylindrical braid) increases, and as a result, the cost of the hollow porous membrane using the support also increases.
In addition, the braid manufactured by the stringing machine has all the constituent yarns assembled diagonally, and the bobbin moves in a complicated manner due to the stringing. Has distortion. As a method for removing the strain, there is a method in which a braid produced by a string making machine is stored in a cage, heat-treated with hot water, a drying furnace or the like, and then wound up. Therefore, it is necessary to go through complicated processes such as a subdivision process of yarn from bobbin, a string making process, a heat treatment process, and a winding process, with a low speed for producing a string for a string making machine, It is an obstacle to productivity improvement.
Patent Document 1 below proposes a string making machine that continuously performs the string making process and the heat treatment process. However, even if the stringing machine is used, the manufacturing process can be simplified, but the stringing speed itself is not improved.

  In addition, the braid usually has elasticity, and when tension is applied, the braid stretches and its outer diameter decreases. For example, when the film-forming solution is applied to a support made of a cylindrical braid, if the tension applied to the support varies, the outer diameter of the support changes. As a result, since the gap between the inner peripheral surface of the pipe line of the annular nozzle and the support changes, the film-forming stock solution cannot be applied with a uniform thickness when the inner diameter of the annular nozzle and the discharge amount of the film-forming stock solution are constant. . In the coagulation step, if the support is stretched before the film-forming stock solution is completely coagulated, defects in the film structure such as pinholes may occur in the porous film layer.

In Patent Document 2 and Patent Document 3 below, a supply roll and a take-up roll are arranged before and after a member having a through hole, and the synthetic fiber string is passed through the through hole and heated above the melting point of the fiber. An apparatus for glossing the surface of a sheet is disclosed.
However, this apparatus is an apparatus that melt-processes (gloss processing) the surface as a subsequent process after manufacturing the string, and is not an apparatus that performs heat treatment as part of the string manufacturing process.
Patent Document 2 describes an embodiment in which a heat treatment device for gloss processing is incorporated into a string rolling / stretching device. However, a string making machine for producing braids and a heat treatment device are continuously connected. The combined form is not described. Even if a braid string making machine and a heat treatment device are provided continuously, the production speed depends on the string making speed of the string making machine, so that the productivity is low as described above.
Japanese Utility Model Publication No. 6-37384. Japanese Patent Laid-Open No. 2002-004142. JP2003-013348A.

  The objective of this invention is providing the apparatus which can manufacture the string-like thing by which the stretching property (outer diameter change) was suppressed with sufficient productivity.

By knitting a cylindrical braid by circular knitting, the inventors have mechanical properties (pressure resistance strength, tensile strength, etc.) equivalent to that of a cylindrical braid, and a cord-like product having better productivity than the braid. And a string-like product with reduced stretchability (change in outer diameter) is obtained by passing the cylindrical knitted string through a heated mold and performing a heat treatment at a temperature lower than the melting temperature of the material. As a result, a patent application has already been filed for a method for producing a support for a hollow porous membrane based on this (Japanese Patent Laid-Open No. 2008-114180).
As a result of further intensive studies on an apparatus suitable for carrying out such a manufacturing method, the present inventors have completed the present invention.

The string-like material manufacturing apparatus of the present invention has a circular knitting machine for circularly knitting yarn and knitting a knitted string, and a through-hole through which the knitted string discharged from the circular knitting machine passes, A heat treatment mold for heat-treating the braid,
A take-up machine for picking up the knitted string that has passed through the through-hole, a detecting means for detecting a difference between a string-making speed of the circular knitting machine and an introduction speed of the knitted string introduced into the through-hole, and the detecting means A feedback control means is provided for controlling the string making speed in the circular knitting machine based on the detection result in.
It is preferable to provide tension applying means for applying tension to the knitted string after being discharged from the circular knitting machine and before being introduced into the heat treatment mold.
It is preferable to provide a dancer roll mechanism provided with a free guide roll that can move up and down as the tension applying means.
It is preferable that a means for detecting the amount of change in the position of the free guide roll is provided as the detection means.
It is preferable to provide a preliminary take-up machine that controls the introduction speed of the braid to be introduced into the through hole.
It is preferable to provide a means for collecting oil smoke generated from the knitted string heat-treated by the heat treatment mold.
As the oil smoke recovery means, a smoke exhaust chamber having a through-hole through which the braid passed through the heat treatment mold passes, an exhaust pump for exhausting the smoke exhaust chamber, and an oil separation filter connected to the exhaust pump; It is preferable that the smoke exhausting device is provided, and the smoke exhaust chamber is connected to the heat treatment mold.

  According to the string manufacturing apparatus of the present invention, a string with suppressed stretchability (change in outer diameter) can be manufactured with high productivity.

  Hereinafter, as an embodiment of the string-like product manufactured by the apparatus of the present invention, a hollow porous membrane support will be described as an example, but the apparatus of the present invention is used for other applications. It is also applicable to the manufacture of

<Hollow porous membrane support>
FIG. 1 is a side view showing an example of a support for a hollow porous membrane (hereinafter referred to as a support) produced by the apparatus of the present invention. The support 13 is obtained by subjecting a cylindrical knitted string 12 formed by circular knitting of yarn to a predetermined heat treatment.

Circular knitting is a process of knitting a cylindrical weft fabric using a circular knitting machine. The cylindrical knitted string 12 forms a continuous loop extending in a spiral shape by curving the yarn. They are related to each other in the front, rear, left and right. The cylindrical braided string 12 is different from a conventional cylindrical braided string 19 as shown in FIG.
Examples of the yarn form include multifilament, monofilament, spun yarn and the like.
Examples of the yarn material include synthetic fiber, semi-synthetic fiber, regenerated fiber, and natural fiber. The yarn may be a combination of a plurality of types of fibers.

  Synthetic fibers include polyamide fibers such as nylon 6, nylon 66, and aromatic polyamide; polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, polylactic acid, and polyglycolic acid; acrylic fibers such as polyacrylonitrile; polyethylene, polypropylene Polyolefin fiber such as polyvinyl alcohol fiber; polyvinylidene chloride fiber; polyvinyl chloride fiber: polyurethane fiber; phenol resin fiber; fluororesin fiber such as polyvinylidene fluoride and polytetrafluoroethylene; polyalkylene paraoxy Examples thereof include benzoate fibers.

Examples of semi-synthetic fibers include cellulose derivative fibers made from cellulose diacetate, cellulose triacetate, chitin, chitosan and the like; protein fibers called promixes, and the like.
Examples of regenerated fibers include cellulosic regenerated fibers (rayon, cupra, polynosic, etc.) obtained by the viscose method, copper-ammonia method, and organic solvent method.
Examples of natural fibers include flax and jute.

As the yarn material, polyester fiber, acrylic fiber, polyvinyl alcohol fiber, polyamide fiber, and polyolefin fiber are preferable from the viewpoint of excellent chemical resistance, and polyester fiber or acrylic fiber is particularly preferable.
As the yarn, a multifilament of synthetic fiber is preferable because the effect of heat treatment in the step (b) described later is easily exhibited.

  The outer diameter of the support 13 is determined by the outer diameter of the hollow porous membrane. The outer diameter of the hollow porous membrane is preferably 1.5 to 6.0 mm, more preferably 2.0 to 3.5 mm, from the required filtration area in the membrane module in which the hollow porous membranes are bundled. Therefore, the outer diameter of the support 13 is preferably 1.0 to 5.0 mm, and more preferably 1.8 to 3.0 mm.

  The fineness of the yarn is preferably 200 to 1000 dtex from the viewpoint of improving the durability of the hollow porous membrane and the adhesiveness with the porous membrane layer. When the fineness of the yarn is 200 dtex or more, the crushing pressure of the hollow porous membrane is improved. When the fineness of the yarn is 1000 dtex or less, a decrease in water permeability due to a reduction in the inner diameter can be suppressed.

The number of stitches of the cylindrical knitted string 12 is preferably 5 or more per round. The number of stitches is the same as the number of knitting needles (knitting needles) of the circular knitting machine described later. When the number of stitches is 5 or more, the cross-sectional shape of the hollow portion of the cylindrical knitted string 12 is circular, and a decrease in water permeability due to a reduction in the inner diameter is suppressed.
The upper limit of the number of stitches is determined by the outer diameter of the cylindrical knitted string 12, the fineness of the yarn, the size of the stitches, and the like. When the stitches are large, when the film-forming stock solution is applied to the support 13, the film-forming stock solution may flow into the support 13 and the hollow portion may be blocked. Therefore, when the cylindrical knitted string 12 having the same outer diameter is manufactured, it is necessary to set a large number of stitches when the fineness of the yarn is high and the number of stitches is small when the fineness is low. The upper limit of the number of stitches is maximum when the outer diameter of the cylindrical knitted string 12 is 5.0 mm and the fineness of the yarn is 200 dtex, and the number is 28.

[First Embodiment]
Next, a first embodiment of the string-like product manufacturing apparatus of the present invention will be described with reference to FIGS. 3 and 4. 3A is a front view of the apparatus, FIG. 3B is a left side view, and FIG. 3C is a top view (the same applies hereinafter). FIG. 4 is a view showing a cross section along both end faces and the length direction of the heat treatment mold.
In the apparatus according to the present embodiment, each component is arranged in the main body frame 1.
In the apparatus of the present embodiment, a circular knitting is performed by circularly knitting yarn 11 supplied from a bobbin of a bobbin stand (not shown), knitting a cylindrical knitted string (hereinafter sometimes simply referred to as a knitted string) 12, and discharging it. A heat treatment mold 4 having a machine 2 and a through-hole 14 through which the knitted string 12 discharged from the circular knitting machine 2 passes, and heat-treating the knitted string 12 in the through-hole 14 and molding it to a desired outer diameter. And a take-up machine 5 for picking up the support 13 (heat-treated cylindrical knitted string 12) that has passed through the heat treatment mold 4 is provided.

The circular knitting machine 2 is configured to discharge the knitted braid 12 downward. The heat treatment mold 4 is provided such that the length direction of the through hole 14 is a vertical direction, the lower side is the inlet 14a, and the upper side is the outlet 14b. The take-up machine 5 is provided above the heat treatment mold 4.
In this embodiment, the knitted string 12 discharged from the circular knitting machine 2 proceeds downward while being suspended by its own weight, and is folded back so as to make a U-turn below the circular knitting machine 2 and the heat treatment mold 4. Then, it advances upward by being taken up by the take-up machine 5, introduced into the through hole 14 of the heat treatment mold 4 from the inlet 14 a, and discharged from the outlet 14 b.

  Below the circular knitting machine 2 and the heat treatment mold 4, there are provided a sensor 6a and a sensor 6b for detecting the folding position P of the cylindrical knitted string 12. The sensor 6a is provided above the sensor 6b. In addition, an operation panel 7 for operating each component is disposed on the front side of the apparatus, and a control panel 8 containing electrical equipment components is disposed on the back side. Further, above the circular knitting machine 2, there are a yarn tensor 9 for applying a constant tension to the yarn 11 supplied to the circular knitting machine 2, and a yarn break sensor 10 for detecting the yarn break and stopping the operation of the apparatus. Has been placed.

  The circular knitting machine 2 has a rotatable cylindrical cylinder, a non-rotating spindle arranged inside the cylinder, and a plurality of knitting needles (knitting needles) arranged on the outer circumference of the spindle. Configured. And it is driven by the V belt from the drive motor 3. The outer diameter, inner diameter, number of stitches and size of the cylindrical knitted string 12 are determined by the number of knitting needles, the circumferential diameter of the spindle on which the knitting needles are arranged, the fineness of the yarn, and the like. The circumferential diameter of the spindle in this embodiment is preferably 3 to 12 mm, and more preferably 4 to 8 mm. The number of knitted needles is preferably 6 to 14, and more preferably 8 to 12. As the drive motor 3, it is preferable to use a brushless DC motor or an AC servo motor in order to cope with high rotation and feedback control described later.

The heat treatment mold 4 includes a main body made of a metal block, a plate, or the like, and a heating unit. Examples of the heating means include a band heater, an aluminum casting heater, and a cartridge heater. The heating temperature varies depending on the yarn to be treated, but is in the range of about 150 ° C to 260 ° C. As the temperature control method, either PID control or ON / OFF control can be used.
A through hole 14 is formed in the main body of the heat treatment mold 4. The inner diameter D at the inlet 14a of the through hole 14 is equal to or slightly larger than the outer diameter D ′ of the cylindrical braid 12 before the heat treatment.
The inner diameter d at the outlet 14b of the through hole 14 is equal to the outer diameter d ′ of the support 13 after the heat treatment.
A length L portion of the through hole 14 from the outlet 14b toward the inlet 14a is a straight portion 14c in which the inner diameter of the through hole 14 is constant at d.
The inner diameter D of the inlet 14a is preferably equal to or larger than the inner diameter d of the outlet 14b. That is, in order to obtain the support 13 having a uniform outer diameter, it is necessary to heat the cylindrical knitted string 12 uniformly. Therefore, D ≧ d is set so that the inner peripheral surface of the through hole 14 and the surface of the cylindrical braided string 12 are always in contact with each other.
The ratio (L / d) between the length L of the straight portion 14c and the inner diameter d of the outlet 14b is preferably 1 or more from the viewpoint of heating the cylindrical braid 12 uniformly.
The through-hole 14 gradually reduces the diameter of the through-hole 14 from the inlet 14a toward the straight portion 14c between the straight portion 14c and the inlet 14a in order to avoid catching the cylindrical knitted string 12. The inner peripheral surface is preferably tapered.
If the length L1 between the straight portion 14c and the inlet 14a is too long, it is difficult to process the taper shape, and the capacity of the heater serving as a heating means increases. Since heating is not possible, it is preferable to set L1 so that these disadvantages do not occur. For example, 100 to 400 mm is preferable, and 200 to 300 mm is more preferable.

  Examples of the take-up machine 5 include a Nelson roll, a nip roll, and a calendar roll. The nip roll may crush the support 13. When it is crushed, the hollow part is closed, and it does not serve as a support for a hollow porous membrane. Therefore, the take-up machine 5 is preferably a Nelson roll or a calendar roll. In order to take the support 13 using these rolls, it is necessary to increase the contact area between the roll and the support 13 to some extent. In the case of a calendar roll, it is necessary to increase the number of rolls in order to ensure a contact area with the support 13. The Nelson roll is more preferable in that the contact area can be secured by winding the support 13 around the two rolls a plurality of times.

  As shown in FIG. 3C, the Nelson roll is generally composed of a drive roll 5a and a free roll 5b attached to the drive roll 5a with a constant inclination angle θ. The support 13 can be taken up by winding the support 13 around the two rolls in a shape of “8” a plurality of times. Further, rubber is lined on the roll surface to suppress the slip of the support 13. The material of the rubber is not particularly limited, and examples thereof include urethane rubber, neoprene rubber, EPDM rubber, and Viton rubber. If the hardness of the rubber is high, the support 13 is likely to slip, and if it is soft, it is easy to wear. As a result of studies by the present inventors, the hardness of the rubber is preferably in the range of Shore A 40 ° to 70 °, more preferably in the range of Shore A 45 ° to 60 °.

  The sensor 6a and the sensor 6b may be any sensors that can detect without contacting a detection object such as a photoelectric sensor, and known sensors can be used. The photoelectric sensor emits “light” such as visible light and infrared light as signal light from the light projecting unit, and detects light reflected by the detection object at the light receiving unit, and detects changes in the amount of light blocked by the light receiving unit. Output signal.

Next, the manufacturing process of the support 13 by this apparatus will be described.
The support 13 is manufactured by the following step (a) and the following step (b).
(A) A step of circularly knitting the yarn 11 to knit the cylindrical knitted string 12.
(B) A step of heat-treating the cylindrical braid 12 through the heat treatment mold 4.

(A) Process The cylindrical knitted string 12 is knitted using the circular knitting machine 2.
The string making speed of the circular knitting machine 2 slightly changes depending on the shape of the cylindrical knitted string 12, but can be controlled by changing the number of rotations of the cylinder. The string making speed of the circular knitting machine 2 in the present invention means the discharge speed of the knitted string 12 discharged from the circular knitting machine 2.
The rotation speed of the cylinder is set according to the take-up speed of the take-up machine 5. When the take-up speed is in the range of 6 to 200 m / hr, the cylinder rotational speed is preferably about 100 to 4000 rpm.

(B) Process Although the cylindrical knitted string 12 has elasticity in the structure, the elasticity (change in an outer diameter) of the cylindrical knitted string 12 can be suppressed by performing heat treatment. .
When passing through the heat treatment mold 4, the cylindrical knitted string 12 is heat-treated at a temperature lower than the melting temperature of the yarn 11 used as a material. As a result, the cylindrical knitted string 12 undergoes thermal shrinkage, the stretchability is suppressed, and the stitches become dense. Further, the outer diameter of the cylindrical braided string 12 is regulated at the straight portion 14c in the vicinity of the outlet 14b, and is molded to a desired outer diameter d ′.
In the heat treatment mold 4, the cylindrical knitted string 12 is processed at a temperature lower than the melting temperature of the yarn, so that the surface of the string is heated at a temperature higher than the melting temperature of the yarn as in the glossy strings of Patent Document 2 and Patent Document 3. It is different from what has been melted. When the surface of the support 13 is melted, the stitches are blocked and the treated water cannot pass, and the performance as a filtration membrane cannot be exhibited.

When the heat treatment mold 4 is continuously provided in the subsequent stage of the circular knitting machine 2 as in this embodiment, the length of the knitted string 12 from the circular knitting machine 2 until it is introduced into the heat treatment mold 4 It is preferable that the fluctuation is small. Further, it is preferable that the fluctuation of the tension applied to the knitted string 12 discharged from the circular knitting machine 2 and the knitted string 12 passing through the heat treatment mold 4 is small.
However, the shrinkage rate of the cylindrical knitted string 12 may fluctuate depending on the heat treatment temperature in the step (b). When the shrinkage rate fluctuates, the heat treatment mold 4 even if the take-up speed of the take-up machine 5 is constant. The introduction speed of the braided string 12 introduced into the through-holes 14 varies. Further, when continuous operation is performed for a long time, the string making speed in the circular knitting machine 2 is not constant, for example, the size of the stitches changes due to wear of the knit needle of the circular knitting machine 2 or the like.
When the string making speed of the circular knitting machine 2 is slower than the introduction speed to the through hole 14, excessive tension is applied to the cylindrical knitting string 12, and the heat treatment mold 4 may not sufficiently heat shrink the knitting string 12. There is. Further, when the string knitting speed of the circular knitting machine 2 is faster than the introduction speed into the through hole 14, the cylindrical knitted string 12 accumulates in the lower part of the apparatus during the long-time operation and is pulled up toward the heat treatment mold 4. It tends to cause troubles.
Therefore, in order to prevent such a problem, it is preferable that the difference between the string making speed (discharge speed) of the circular knitting machine 2 and the introduction speed into the through hole 14 is always kept small, and both are always equal. Is most preferred.

In the present embodiment, as a detecting means for detecting the difference between the string making speed of the circular knitting machine 2 and the introduction speed of the knitting string 12 introduced into the through hole 14 of the heat treatment mold 4, Sensors 6a and 6b for detecting a folding position P of the discharged cylindrical knitted string 12 are provided.
Further, when it is detected that the folding position P of the cylindrical knitted string 12 is above the upper sensor 6a or below the lower sensor 6b, based on the detection result, the circular knitting machine 2 Feedback control means (not shown) for controlling the string making speed of the circular knitting machine 2 by increasing or decreasing the number of rotations of the cylinder is provided.

Specifically, the initial value of the string making speed of the circular knitting machine 2 and the initial take-up speed of the take-up machine 5 so that the folding position P of the cylindrical knitted string 12 is located between the sensor 6a and the sensor 6b. Set the value.
When the folding position P of the cylindrical knitted string 12 is above the upper sensor 6a, the feedback control means increases the cylinder rotation speed of the circular knitting machine 2 to increase the stringing speed, and the folding position. When P becomes lower than the side sensor 6b, it is set to reduce the string rotation speed by reducing the cylinder rotation speed of the circular knitting machine 2.

  According to the apparatus of the present embodiment, the circular knitting machine 2 and the heat treatment mold 4 are continuously provided, so that the heat treatment mold 4 causes the knitted string 12 to be thermally contracted and stretchable (change in outer diameter). It is possible to manufacture the support 13 in which the suppression is suppressed with high productivity. Moreover, since the difference between the string making speed (discharge speed) of the circular knitting machine 2 and the introduction speed of the heat treatment mold 4 into the through hole 14 is always kept small, the braid between the circular knitting machine 2 and the heat treatment mold 4 The variation of the length of 12 and the variation of the tension applied to the knitted string 12 discharged from the circular knitting machine 2 and the knitted string 12 passing through the heat treatment mold 4 can be suppressed, and the production stability is good.

[Second Embodiment]
Next, a second embodiment of the string-like product manufacturing apparatus of the present invention will be described with reference to FIG. In FIG. 5, the same components as those in FIG.
The apparatus of this embodiment is different from the apparatus of the first embodiment in that tension is applied to the cylindrical knitted string 12 discharged from the circular knitting machine 2 between the circular knitting machine 2 and the turning point P. The air ejector 15 (tension applying means) is provided.
The air ejector 15 only needs to be able to apply a certain tension to the cylindrical braid 12 passing through the inside by supplying a gas (air) with a predetermined pressure to the air ejector 15. For example, a known vacuum generator can be used. The pressure of the supplied gas is in the range of about 0.1 MPa to 0.7 MPa, although it depends on the operating conditions.

According to the present embodiment, the same effects as the first embodiment can be obtained, and the following effects can be obtained.
That is, when the circular knitting machine 2 is used to form the cylindrical knitted string 12, depending on the manufacturing conditions such as the circumferential diameter of the spindle, the number of knitted needles, the fineness of the yarn, the stitches are difficult to be removed from the knitted needle, The knitted string 12 is not discharged below the circular knitting machine 2, which causes a trouble that the yarn is entangled with the knitted needle. According to the present embodiment, it is possible to increase the tension applied to the formed cylindrical knitted string 12, thereby making it easier for the stitches to come off from the knitted needles and preventing such troubles.

[Third Embodiment]
Next, a third embodiment of the string-like manufacturing apparatus of the present invention will be described with reference to FIG. In FIG. 6, the same components as those of FIG.
The apparatus of this embodiment differs greatly from the apparatus of the first embodiment in that a dancer roll mechanism 16 (tension applying means) is provided on the U-turn portion of the knitted string 12 below the circular knitting machine 2 and the heat treatment mold 4. And a free guide roll of the dancer roll mechanism 16 as a detecting means for detecting a difference between the string making speed of the circular knitting machine 2 and the introduction speed of the braid 12 introduced into the through hole 14 of the heat treatment mold 4. The position detector 17 for detecting the change amount of the position 16c is provided.

  The dancer roll mechanism 16 includes a free guide roll 16c provided at one end of a balance-like shaft 16b orthogonal to the rotation shaft 16a, and a balance adjustment weight 16d provided at the other end, as shown in FIG. Thus, the free guide roll 16c can be moved up and down. The weight and the fixed position of the weight 16d can be arbitrarily changed, whereby the weight of the free guide roll 16c, that is, the load (tension) applied to the cylindrical knitted string 12 can be changed. The tension applied to one side of the cylindrical knitted string 12, that is, the cylindrical knitted string 12 between the circular knitting machine 2 and the free guide roll 16c is ½ of the weight of the free guide roll 16c.

A position detector 17 is attached to the rotating shaft 16a, and is configured to detect a change amount when the position of the free guide roll 16c changes upward or downward from a preset initial position. ing.
Further, when it is detected that the amount of change in the position of the free guide roll 16c is larger than a preset amount, the number of rotations of the cylinder is increased or decreased based on the detection result, and the string making of the circular knitting machine 2 is performed. Feedback control means (not shown) for controlling the speed is provided.
Specifically, when the position of the free guide roll 16c is moved upward, the cylinder rotation speed of the circular knitting machine 2 is increased, the string making speed is increased, and the position of the free guide roll 16c is moved downward. Is controlled and controlled so that the cylinder rotation speed of the circular knitting machine 2 is reduced and the string making speed is reduced. As a result, the difference between the string making speed (discharge speed) of the circular knitting machine 2 and the introduction speed of the heat treatment mold 4 into the through hole 14 is always kept small.

In addition, the code | symbol 20 in a figure is a guide roll for making the advancing direction of the braided string 12 into a perpendicular direction just before introduce | transducing into the through-hole 14 of the heat processing metal mold | die 4. FIG.
According to the present embodiment, the same operational effects as those of the first and second embodiments can be obtained.

[Fourth Embodiment]
Next, a fourth embodiment of the string-like product manufacturing apparatus of the present invention will be described with reference to FIG. In FIG. 7, the same components as those of FIG.
The difference between the apparatus of the present embodiment and the apparatus of the third embodiment is that a guide roll 20 is not provided between the dancer roll mechanism 16 and the heat treatment mold 4 and a preliminary take-up machine 18 is provided.
The preliminary take-up machine 18 includes a Nelson roll having the same configuration as the take-up machine 5. That is, it consists of a drive roll 5a and a free roll 5b attached to the drive roll 5a with a constant inclination angle θ, and these two rolls are knitted on the way from the dancer roll mechanism 16 to the heat treatment mold 4 12 is wound in a shape of “8” a plurality of times. The take-up speed in the preliminary take-up machine 18 can be controlled independently. Therefore, it is possible to control and operate so that the ratio between the take-up speed of the preliminary take-up machine 18 and the take-up speed of the take-up machine 5 becomes a predetermined value.

  According to this embodiment, by adjusting the ratio of the take-up speed of the preliminary take-up machine 18 and the take-up speed of the take-up machine 5, the cylindrical braid 12 passing through the through hole 14 of the heat treatment mold 4 is added. The tension can be arbitrarily adjusted, whereby the size of the stitches of the support 13 can be controlled. For example, by setting the take-up speed of the preliminary take-up machine 18 faster than the take-up machine 5, the tension of the cylindrical knitted string 12 traveling in the through hole 14 can be set low. In this case, the cylindrical knitted string Since 12 is sufficiently contracted, the stitches of the support 13 are reduced. On the other hand, if the take-up speed of the preliminary take-up machine 18 is set slower than the take-up machine 5, the tension of the cylindrical knitted string 12 traveling in the through hole 14 increases and the cylindrical knitted string 12 is stretched. For this reason, the stitches of the support 13 can be enlarged.

  Further, in the present embodiment, as in the third embodiment, the tension is applied to the cylindrical knitted string 12 discharged from the circular knitting machine 2 by the dancer roll mechanism 16, so that the stitches are easily removed from the knit needle. It has become. Further, since the string forming speed of the circular knitting machine 2 is feedback-controlled based on the change amount of the position of the free guide roll 16c, the string forming speed (discharge speed) of the circular knitting machine 2 and the through hole 14 of the heat treatment mold 4 are controlled. The difference from the introduction speed into the vehicle is always kept small.

[Modification 1]
In the said 1st-4th embodiment, when the material of the thread | yarn to be used is a synthetic fiber containing an oil agent, an oil agent is heated with the heat processing metal mold | die 4, and the oil smoke from the support body 13 after heat processing is carried out. May occur. If this oily smoke is discharged outside the machine, it is not environmentally preferable. It is preferable to provide an oil smoke recovery device that collects and liquefies and recovers such oil smoke as needed. It is preferable that the oil smoke recovery device is provided in the subsequent stage of the heat treatment mold 4. More preferably, an oil smoke recovery device is connected to the heat treatment mold 4.

8 and 9 show an example of the oil smoke recovery device, FIG. 8 is a schematic configuration diagram, and FIG. 9 is a cross-sectional view of the main part. The oil smoke recovery device 20 of this example includes a smoke exhaust chamber 21, an exhaust pump 22, and an oil separation filter 23.
The smoke exhaust chamber 21 includes a tubular inlet side member 24, a tubular outlet side member 25, and a pipe joint 26 that communicates these members. The inlet side member 24 and the outlet side member 25 have a cylindrical through hole. The inlet side member 24 is connected to the outlet 14 b of the heat treatment mold 4.
The pipe joint 26 has a cylindrical through hole, and a suction port 26 a that communicates the inside and the outside of the through hole is provided in the middle of the through hole. An exhaust pipe 27 is connected to the suction port 26 a of the pipe joint 26, and the exhaust pipe 27 is connected to the exhaust pump 22. The exhaust pump 22 is connected to the oil separation filter 23.
As shown in FIG. 9, the inside of the inlet side member 24, the inside of the pipe joint 26, and the inside of the outlet side member 25 form a straight space portion, and the space portion defines the heat treatment mold 4. It is a cylindrical through-hole through which the passed support 13 (heat-treated cylindrical braid 12) passes.

  Since the material of the inlet side member 24, the outlet side member 25, and the pipe joint 26 receives heat from the heat treatment mold 4, it is preferably made of metal. It is preferable that a threaded pipe joint is used as the pipe joint 26 and that the inlet side member 24 and the pipe joint 26 and the outlet side member 25 and the pipe joint 26 are detachable. If these are detachable, they can be easily washed and replaced when an oil agent adheres to the inside.

  The support 13 that has passed through the heat treatment mold 4 is introduced into the smoke exhaust chamber 21 of the oil smoke recovery device 20. When the material of the thread constituting the support 13 contains an oil, when the oil is heated by the heat treatment mold 4, oil smoke is generated from the support 13 in the internal space of the inlet side member 24 and the pipe joint 26. To do. The generated oil smoke is discharged from the suction port 26a through the resin or metal exhaust pipe 27 by the exhaust pump 22, becomes an oil agent by the oil separation filter 23, and is recovered as drain.

The inner diameter d 1 of the inlet side member 24 and the pipe joint 26 is larger than the inner diameter d of the outlet 14 b of the heat treatment mold 4. The difference between the inner diameters (d1−d) is not particularly limited, but if it is too small, the internal space capacity of the inlet side member 24 becomes small and sufficient oil smoke is not generated from the support 13, and if it is too large, the inlet side is small. Since the internal space capacity of the member 24 is increased, the exhaust flow velocity from the suction port 26a is decreased, and there is a possibility that the oil smoke is condensed and cannot be sufficiently recovered, 0.5 to 10 mm is preferable, and 1 to 3 mm is more preferable.
If the length L3 of the internal space combining the inlet side member 24 and the pipe joint 26 is too long, the oil smoke comes into contact with the inner wall surface of the inlet side member 24 and is condensed before being discharged from the suction port 26a. There is a possibility that it cannot be recovered, and if it is too short, the internal space capacity becomes small, and sufficient oily smoke is not generated from the support 13, so 10 to 200 mm is preferable, and 40 to 100 mm is more preferable.
The inner diameter d2 of the outlet side member 25 is preferably equal to or larger than the outer diameter d ′ of the support 13 that has come out of the heat treatment mold 4 and is equal to or smaller than the outer diameter d ′ + 0.5 mm. When d2 is smaller than the outer diameter d ′ of the support 13, the surface of the support 13 may be damaged by friction, which is not preferable. On the other hand, if d2 is larger than the outer diameter d ′ by 0.5 mm or more, the oily smoke tends to leak out from the gap, which is not preferable.
The length L4 of the outlet side member 25 is preferably determined according to the passing speed of the support 13, that is, the take-up speed of the take-up machine 5. When the passing speed of the support 13 is high, it is preferable to lengthen L4 because oil smoke may leak to the outside of the apparatus accompanying the support 13. For example, when the take-up speed is 3.34 m / min, the value of L4 is preferably 50 mm or more. However, if the value of L4 is longer than necessary, the resistance of the air flowing from the outlet of the outlet side member 25 increases, so the amount of air flowing into the heat treatment mold 4 from the inlet 14a increases, and the heat treatment mold 4 The internal heat is taken away, and a sufficient amount of heat is not given to the cylindrical knitted string 12, which may cause insufficient heat shrinkage. The upper limit of the length L4 of the outlet side member 25 is preferably 200 mm or less and more preferably 150 mm or less from the above viewpoint.

The structure of the exhaust pump 22 is not particularly limited, and a general air pump, a vacuum pump, or the like can be used. When a diaphragm type exhaust pump is used, oil smoke may leak out of the machine from the outlet of the outlet side member 25 by blowing back, so a check valve (in the middle of the exhaust pipe 27 connecting the suction port 26 and the exhaust pump 22) (Not shown) is preferably provided.
It is desirable that the exhaust amount of the exhaust pump 22 is appropriately selected according to the amount of generated smoke. However, if a pump with a displacement larger than necessary is used, a large amount of air flows into the heat treatment mold 4 from the inlet 14a, and the heat inside the heat treatment mold 4 is taken away, so that a sufficient amount of heat is applied to the cylindrical braid 12. The heat shrinkage may not be sufficient.

The oil separation filter 23 only needs to be capable of liquefying oil smoke and filtering to recover the oil agent.
For example, a general oil mist collecting structure can be used. It is preferable to appropriately select the filtration accuracy of the oil separation filter according to the size of the oil smoke particles.

[Modification 2]
In the first to fourth embodiments, instead of the heat treatment mold 4 shown in FIG. 4, a heat treatment mold 4 ′ shown in FIG. 10 may be used. 10, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted.
In the heat treatment mold 4 shown in FIG. 4, the inner diameter of the through hole 14 gradually decreases from the inlet 14a toward the straight portion 14c between the straight portion 14c near the outlet 14b of the through hole 14 and the inlet 14a. ing. On the other hand, in the heat treatment mold 4 ′ shown in FIG. 10, the inner diameter of the through hole 14 is constant from the inlet 14 a side toward the straight portion 14 c adjacent to the straight portion 14 c near the outlet 14 b of the through hole 14. A taper portion 14e is provided which suddenly decreases in diameter at the angle θ. Further, the portion of the length L2 between the tapered portion 14e and the inlet 14a of the through-hole 14 has an inner diameter of the through-hole 14 that is constant at D and is an inlet-side straight portion 14c ′.
As shown in FIG. 10, when the tapered portion 14 e is viewed in a cross section along a plane along the length direction of the through hole 14, the angle θ formed by the opposing tapered surfaces is preferably 3 to 90 degrees, and 10 to 20 degrees. More preferred. When θ is smaller than 3 degrees, only the same effect as the heat treatment mold 4 shown in FIG. 4 can be obtained, and when it is larger than 90 degrees, the cylindrical knitted string 12 is easily caught on the tapered portion 14e.
If the length L2 of the inlet-side straight portion 14c ′ is too long, it is difficult to process the straight portion 14c ′, and the capacity of the heater serving as a heating means increases. If the length L2 is too short, the cylindrical braid 12 is sufficiently heated. Since it is impossible, it is preferable to set so that these inconveniences do not occur. For example, 100 to 400 mm is preferable, and 200 to 300 mm is more preferable.

As shown in FIG. 4, the heat treatment mold 4 having a structure in which the diameter gradually decreases from the inlet 14a of the through hole 14 toward the straight portion 14c, the diameter of the through hole 14 is gradually reduced. Has a relatively open structure.
On the other hand, as shown in FIG. 10, when using a heat treatment mold 4 ′ having a structure having a tapered portion 14 e that suddenly shrinks in the middle of the through hole 14, the cylindrical braid 12 introduced into the through hole 14 is The entrance-side straight portion 14c ′ undergoes a certain amount of thermal contraction, and then the diameter of the taper portion 14e is rapidly reduced, so that the stitch is likely to be crushed.
It is preferable to select the structure of the heat treatment mold according to the stitch state to be obtained.

Hereinafter, the present invention will be described in more detail using examples, but the present invention is not limited to these examples.
(Example 1)
A support 13 was manufactured by the apparatus shown in FIG. As the yarn 11, a polyester fiber (fineness: 420 dtex, number of filaments: 360) was used. As the circular knitting machine 2, a string knitting machine (number of knitting needles: 8, needle size: 16 gauge, spindle diameter: 6 mm) manufactured by Sakurai Textile Machinery Co., Ltd. was used. As the heat treatment mold 4, an aluminum alloy mold (inner diameter D: 5 mm, inner diameter d: 2.0 mm, L / d: 2, L1: 260 mm) having heating means using a band heater was used. The heating temperature was 200 ° C., and the take-up speed of the take-up machine 5 was 0.5 m / min. The initial value of the string making speed of the circular knitting machine 2 was about 0.4 m / min. During operation, the cylindrical knitted string 12 was always between the sensor 6a and the sensor 6b, and the cylinder rotation speed of the circular knitting machine 2 was controlled at around 500 rpm. The outer diameter of the obtained support 13 was 2.0 mm. The number of stitches was 8 per lap.

(Example 2)
The support 13 was manufactured by the apparatus shown in FIG. As the yarn 11, a polyester fiber (fineness: 504 dtex, filament number: 432) was used. As the circular knitting machine 2, a string knitting machine (number of knitting needles: 12, needle size: 16 gauge, spindle diameter: 8 mm) manufactured by Sakurai Textile Machinery Co., Ltd. was used. The heat treatment mold 4 was an aluminum alloy mold (inner diameter D: 5 mm, inner diameter d: 3.0 mm, L / d: 5, L1: 260 mm) having heating means using a band heater. The heating temperature was 215 ° C., and the take-up speed of the take-up machine 5 was 1.5 m / min. The initial value of the string making speed of the circular knitting machine 2 was about 1.4 m / min. As the air ejector 15, a vacuum generator (model: VRL300, suction port diameter: 8 mm) manufactured by Nippon Pisco Co., Ltd. was used. The supplied air pressure was 0.3 MPa. During operation, the cylindrical knitted string 12 was always between the sensor 6a and the sensor 6b, and the cylinder rotation speed of the circular knitting machine 2 was controlled at around 1700 rpm. The outer diameter of the obtained support 13 was 3.0 mm. The number of stitches was 12 per lap.

(Example 3)
A support 13 was manufactured by the apparatus shown in FIG. As the yarn 11, a polyester fiber (fineness: 336 dtex, filament number: 288) was used. The circular knitting machine 2 was the same as that used in Example 2. The heat treatment mold 4 was a stainless steel mold (inner diameter D: 5 mm, inner diameter d: 2.3 mm, L / d: 10, L1: 260 mm) having heating means using a band heater. The heating temperature was 190 ° C., and the take-up speed of the take-up machine 5 was 3.34 m / min. The initial value of the string making speed of the circular knitting machine 2 was 2.6 m / min. The weight of the free guide roll 16c of the dancer roll mechanism 16 was 40 g. During operation, the free guide roll 16c was at a substantially constant position, and the cylinder rotation speed of the circular knitting machine 2 was controlled at around 3300 rpm. The outer diameter of the obtained support 13 was 2.3 mm. A photograph of the outer surface of the obtained support 13 is shown in FIG. The stitches were uniform and the number of stitches was 12 per round.

Example 4
The support 13 was manufactured by the apparatus shown in FIG. The conditions were the same as in Example 3 except that the speed of the preliminary take-up machine 18 was 2.6 m / min. During operation, the free guide roll 16c was at a substantially constant position, and the cylinder rotation speed of the circular knitting machine 2 was controlled at around 3300 rpm. The outer diameter of the obtained support 13 was 2.3 mm. The number of stitches was 12 per lap.

(Example 5)
In the apparatus of FIG. 6, the support 13 was manufactured using the heat treatment mold 4 ′ shown in FIG. That is, the same as Example 3 except that the heat treatment mold was changed to a stainless steel mold (inner diameter D: 5 mm, L2: 250 mm, inner diameter d: 2.3 mm, L / d: 10, angle θ: 15 degrees). Condition. During operation, the free guide roll 16c was at a substantially constant position, and the cylinder rotation speed of the circular knitting machine 2 was controlled at around 3300 rpm. The outer diameter of the obtained support 13 was 2.3 mm. A photograph of the outer surface of the obtained support 13 is shown in FIG. The stitches were uniform and crushed compared to Example 3. The number of stitches was 12 per lap.

(Example 6)
The support 13 was manufactured by providing the oil smoke recovery device 20 in the apparatus of FIG. In the smoke exhaust chamber 21 of the oil smoke recovery device 20, the inner diameter d1 of the inlet side member 24 and the pipe joint 26 is 4 mm, and the length L3 is 30 mm. In addition, the inner diameter d2 of the outlet side member 25 was 2.4 mm, and the length L4 was 50 mm. An air pump (model: APN-085, maximum air volume: 5 L / min) manufactured by Iwaki Co. was used as the exhaust pump 22, and a micro mist separator (model: AMD250) manufactured by SMC was used as the oil separation filter 23. Other conditions were the same as in Example 3, and a support was obtained. During operation, oil smoke did not leak outside the apparatus, and after operation for about 100 hours, about 180 ml of oil was obtained from the drain outlet of the oil separation filter 23.

It is a side view which shows an example of the support body for hollow porous membranes obtained with the manufacturing apparatus of the cylindrical braided string of this invention. It is a side view which shows an example of the cylindrical braid used as a conventional support body for hollow porous membranes. It is a three-plane figure which shows 1st Embodiment of the string manufacture apparatus of this invention. It is the end view and side sectional view which show an example of the heat processing metal mold | die. It is a three-plane figure which shows 2nd Embodiment of the string-shaped material manufacturing apparatus of this invention. It is a three-plane figure which shows 3rd Embodiment of the string-shaped material manufacturing apparatus of this invention. It is a three-plane figure which shows 4th Embodiment of the string-shaped material manufacturing apparatus of this invention. It is the schematic which shows the example of the oil smoke collection | recovery apparatus used for the string manufacturing apparatus of this invention. It is a sectional side view of the principal part of the oil smoke recovery apparatus of FIG. It is the end view and side sectional view which show another example of the heat processing metal mold | die. It is a photograph which shows the outer surface of the support body 13 obtained in the Example. It is a photograph which shows the outer surface of the support body 13 obtained in the other Example.

Explanation of symbols

2 Circular knitting machine,
4 Heat treatment mold,
5 take-up machine,
6a, 6b sensor (detection means),
11 Yarn,
12 cylindrical braid,
13 support (support for hollow porous membrane),
14 through-holes,
15 Air ejector (vacuum generator),
16 Dancer roll mechanism,
18 Preliminary take-up machine,
20 Oil smoke recovery device,
21 Smoke exhaust chamber 22 Exhaust pump,
23 Oil separation filter.

Claims (7)

A circular knitting machine for circular knitting yarn and knitting knitted string;
A heat treatment mold having a through-hole through which the knitted string discharged from the circular knitting machine passes, and heat-treating the knitted string in the through-hole,
A take-up machine for picking up the knitted string that has passed through the through hole;
Detecting means for detecting a difference between a string making speed of the circular knitting machine and an introduction speed of the knitting string introduced into the through hole;
An apparatus for manufacturing a string-like article, comprising feedback control means for controlling a string making speed in the circular knitting machine based on a detection result of the detecting means.   The string-like product manufacturing apparatus according to claim 1, further comprising a tension applying unit that applies tension to the knitted string before being introduced into the heat treatment mold after being discharged from the circular knitting machine.   The string-shaped article manufacturing apparatus according to claim 2, further comprising a dancer roll mechanism including a free guide roll that can move up and down as the tension applying means.   The string-shaped article manufacturing apparatus according to claim 3, comprising means for detecting a change amount of the position of the free guide roll as the detection means.   The string-like product manufacturing apparatus according to any one of claims 1 to 4, further comprising a preliminary take-up machine that controls an introduction speed of a braid introduced into the through hole.   The string manufacturing apparatus according to any one of claims 1 to 5, further comprising means for collecting oil smoke generated from the knitted string heat-treated by the heat treatment mold.   As the oil smoke recovery means, a smoke exhaust chamber having a through-hole through which the braid passed through the heat treatment mold passes, an exhaust pump for exhausting the smoke exhaust chamber, and an oil separation filter connected to the exhaust pump; The string-like material manufacturing apparatus according to claim 6, further comprising: an oil smoke recovery device having a gas exhaust smoke collecting device connected to the heat treatment mold.

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